基于ARM的嵌入式远程视频监控系统的设计

随着数字图像技术、嵌入式计算机技术和通信技术的飞速发展,嵌入式图像监控系统己成为当今监控领域的一个?新的研究热点.出现了基于嵌入式和Internet的视频监控系统.本文提出了一种基于ARM的远程视频监控系统的体系结构,该体系结构将硬件分为两大模块,系统以基于ARM7内核的嵌入式微处理器LPC2210为核心,嵌入式实时操作系统μC/OS-Ⅱ作为软件开发平台.本文还着重阐述了监控系统的原理、设计方案,硬件模块和软件模块的实现方法.     

一种无源轮胎压力监测系统的设计

本文介绍了一种基于英飞凌SP30传感器的无源轮胎压力监测系(Battery-less TPMS)的设计,并给出了相关的程序流图、通信协议等.该系统可测定轮胎内部的温度和气压,确定故障轮胎并实时发出警告,避免爆胎事故的发生.     

一种通用无线智能终端的设计与实现

针对中小批量测控系统开发周期长、低层次重复开发严重及性能难以保证等问题,提出了通用智能终端的设计思想.该终端采用模块化结构,由核心模块和信息采集模块、输出模块、无线通讯模块、模糊控制模块等诸功能模块组成,终端配置可根据需要灵活裁剪.多个智能终端通过无线通讯可灵活组建成无线测控网络,模糊控制原型模块的开发使得构建专用模糊控制系统变得简易而快捷.这为中小批量测控系统的开发研制提供了极大便利,是一种用实用性强、途广泛、极具推广价值的智能终端.     

一种基于事务的SoC功能验证方法

本文介绍了基于事务的SoC验证方法,详细说明了事务、事务处理器的概念和事务级验证平台的功能结构.Synopsys公司的RVM验证方法学是当前比较流行的基于事务的SoC验证方法,文中详细介绍了RVM验证平台的层次结构.并且以一个UART模块的功能验证为例,描述了如何利用RVM验证方法学搭建一个高效的可重用的验证平台.     

基于ARM嵌入式近红外光谱仪器的研制

本文介绍了基于ARM微处理器的嵌入式近红外光谱仪器设计,并给出了仪器的软件和硬件的设计方案.设计应用了最先进的ARM嵌入式技术,利用ARM丰富的内部设备,实现了光谱数据的传输和基于触摸屏的人机交互平台.实现近红外光谱仪器操作简单化,体现了ARM微处理器的优胜之处.     

Numerical algorithms and results for SC-cut quartz plates vibrating at the third harmonic overtone of thickness shear

Finite element matrix equations, derived from two-dimensional piezoelectric high frequency plate theory are solved to study the vibrational behavior of the third overtone of thickness shear in square and circular SC-cut quartz resonators. The mass-loading and electric effects of electrodes are included. A perturbation method which reduces the memory requirements and computational time significantly is employed to calculate the piezoelectric resonant frequencies. A new storage scheme is introduced which reduces memory requirements for mass matrix by about 90% over that of the envelope storage scheme. Substructure techniques are used in eigenvalue calculation to save storage. Resonant frequency and the mode shapes of the harmonic third overtone thickness shear vibrations for square and circular plates are calculated. A predominant third overtone thickness shear displacement, coupled with the third overtone of thickness stretch and thickness twist, is observed. Weak coupling between the third order thickness shear displacement and the zeroth-, first-, and second-order displacements is noted. The magnitudes of the lower order displacements are found to be about two orders smaller than that of the third overtone thickness shear displacement.     

A modified low-pass filter with progressively diminishing ripples

A modified low-pass filter functions are proposed. A modified inverse Chebyshev function possesses progressively diminishing ripples in the stopband whereas the modified Chebyshev function exhibits ripples diminishing toward = 0 in the passband.Both are realizable in the doubly-terminated ladder structures for the ordern even or odd, thus lending themselves amenable to high-quality activeRC or switched capacitor filters through the simulation techniques.     

Characteristics of Fe/AlPO4-5 catalyst prepared with organic solution

The Fe/AlPO₄-5 catalysts are prepared by impregnation with aqueous and organic solution (acetic acid, alcohol and acetone) of iron(III) nitrite respectively. The characterization of catalyst by means of XPS, Mössbauer spectroscopy, TPR and CO hydrogenation is reported. The catalyst prepared with the aqueous solution has no activity for CO hydrogenation because the Fe(III) in the catalyst cannot be reduced to -Fe. However, the catalysts prepared with organic solution possess obvious hydrogenation activity, in which -Fe is present in the initial reduced catalyst besides Fe³⁺ and Fe²⁺. The results may be explained by the interaction degrees between the metal and the support induced by the different impregnation solvents.     

Localization effects in transition-metal doped Bi2Sr2CaCu2O8+y high-temperature superconductors

Doping Bi₂Sr₂Ca₁Cu₂O_8+y with Co causes a superconductor-insulator transition. We study correlations between changes in the electrical resistivity _ab(T) and the electronic bandstructure using identical single crystalline samples. For undoped samples the resistivity is linear in temperature and has a vanishing residual resistivity. In angle resolved photoemission these samples show dispersing band-like states. Co-doping decreases T_c and causes and increase in the residual resistivity. Above a threshold Co-concentration the resistivity is metallic (d_ab/dT>0) at room temperature, turns insulating below a characteristic temperature T_min and becomes superconducting at even lower temperature. These changes in the resistivity correlate with the disappearance of the dispersing band-like states in angle resolved photoemission. We show that Anderson localization caused by the impurity potential of the doped Co-atoms provides a consistent explanation of all experimental features. The coexistance of insulating (d_ab/dT <0) normal state behavior and superconductivity indicates that the superconducting ground state is formed out of spatially almost localized carriers.